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c/coa·submitted 1 year ago by u/yannick_haddad

area percent — my 20-week log, condensed into one table

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Posting this because I searched for it and got nothing useful. Setup: 0.5mg, week 78, injection-site soreness present but not ruining anything. I changed exactly one variable — related substances — and tracked it for 4 weeks. Result: a difference, but a small one, and well inside what I would call noise if someone…

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8 comments, started 1 year ago
u/tomas_lehtinen80 points·1 year ago

Strongly agree. Mass% and area% are answering different questions on the same document.

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u/nikhil_lindqvist0 points·1 year ago

Strongly agree.

Yes, exactly this, and it is the bit that took me 66 weeks to accept.

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u/anya_moreau1 point·1 year ago

Strongly agree. Mass% and area% are answering different questions on the same document.

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u/clara_restrepo1 point·1 year ago

PDF metadata is checkable in fifteen seconds

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u/ignacio_silva1 point·1 year ago

chromatogram or it did not happen

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u/wanjiru_varga-30 points·1 year ago

PDF metadata is checkable in fifteen seconds

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u/foam_head_fred1 point·1 year ago

Slight fix: the number was 98.7, not 98.9. Decimal point, but a fairly consequential one.

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u/anya_correia1 point·1 year ago

This is the correct framing. The COA structure matters as much as the number.

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How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

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